Annual report pursuant to Section 13 and 15(d)

Fair Values of Assets and Liabilities (Recurring basis) (Details)

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Fair Values of Assets and Liabilities (Recurring basis) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets measured at fair value on a recurring basis      
MSR's $ 35,202 $ 65,001 $ 125,679
Recurring Basis [Member]
     
Assets measured at fair value on a recurring basis      
Mortgage loans held for sale 452,949 343,588  
Trading account securities 91,205 45,899  
Available-for-sale and other securities 7,258,100 7,791,499  
Automobile loans 142,762 296,250  
MSR's 35,202 65,001  
Derivative assets 385,697 403,002  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 123,039  
Derivative liabilities 152,188 265,316  
Other liabilities 0 751  
Recurring Basis [Member] | U.S. Treasury [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 52,311 53,204  
Recurring Basis [Member] | Federal agencies - mortgage backed securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 5,541  
Available-for-sale and other securities 4,264,670 4,464,892  
Recurring Basis [Member] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Federal agencies: Other agencies [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 359,626 735,544  
Recurring Basis [Member] | Municipal securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 15,218 8,147  
Available-for-sale and other securities 501,000 407,726  
Recurring Basis [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 71,568 72,364  
Recurring Basis [Member] | Asset-backed Securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 1,029,083 967,088  
Recurring Basis [Member] | Covered Bonds [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 290,625 504,045  
Recurring Basis [Member] | Corporate debt [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 668,142 528,883  
Recurring Basis [Member] | Other securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 75,987 32,211  
Available-for-sale and other securities 21,075 57,753  
Recurring Basis [Member] | Level 1 [Member]
     
Assets measured at fair value on a recurring basis      
Mortgage loans held for sale 0 0  
Trading account securities 75,729 32,085  
Available-for-sale and other securities 69,488 106,823  
Automobile loans 0 0  
MSR's 0 0  
Derivative assets 6,368 4,886  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivative liabilities 6,813 12,245  
Other liabilities 0 0  
Recurring Basis [Member] | Level 1 [Member] | U.S. Treasury [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 52,311 53,204  
Recurring Basis [Member] | Level 1 [Member] | Federal agencies - mortgage backed securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | Federal agencies: Other agencies [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | Municipal securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | Asset-backed Securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | Covered Bonds [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | Corporate debt [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 1 [Member] | Other securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 75,729 32,085  
Available-for-sale and other securities 17,177 53,619  
Recurring Basis [Member] | Level 2 [Member]
     
Assets measured at fair value on a recurring basis      
Mortgage loans held for sale 452,949 343,588  
Trading account securities 15,476 13,814  
Available-for-sale and other securities 6,968,572 7,395,522  
Automobile loans 0 0  
MSR's 0 0  
Derivative assets 465,517 485,428  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 123,039  
Derivative liabilities 228,312 246,132  
Other liabilities 0 751  
Recurring Basis [Member] | Level 2 [Member] | U.S. Treasury [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 2 [Member] | Federal agencies - mortgage backed securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 5,541  
Available-for-sale and other securities 4,264,670 4,464,892  
Recurring Basis [Member] | Level 2 [Member] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 2 [Member] | Federal agencies: Other agencies [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 359,626 735,544  
Recurring Basis [Member] | Level 2 [Member] | Municipal securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 15,218 8,147  
Available-for-sale and other securities 439,772 312,634  
Recurring Basis [Member] | Level 2 [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 22,793 0  
Recurring Basis [Member] | Level 2 [Member] | Asset-backed Securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 919,046 845,390  
Recurring Basis [Member] | Level 2 [Member] | Covered Bonds [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 290,625 504,045  
Recurring Basis [Member] | Level 2 [Member] | Corporate debt [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 668,142 528,883  
Recurring Basis [Member] | Level 2 [Member] | Other securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 258 126  
Available-for-sale and other securities 3,898 4,134  
Recurring Basis [Member] | Level 3 [Member]
     
Assets measured at fair value on a recurring basis      
Mortgage loans held for sale 0 0  
Trading account securities 0 0  
Available-for-sale and other securities 220,040 289,154  
Automobile loans 142,762 296,250  
MSR's 35,202 65,001  
Derivative assets 13,180 6,770  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivative liabilities 478 6,939  
Other liabilities 0 0  
Recurring Basis [Member] | Level 3 [Member] | U.S. Treasury [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 3 [Member] | Federal agencies - mortgage backed securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 3 [Member] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 3 [Member] | Federal agencies: Other agencies [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 3 [Member] | Municipal securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 61,228 95,092  
Recurring Basis [Member] | Level 3 [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 48,775 72,364  
Recurring Basis [Member] | Level 3 [Member] | Asset-backed Securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 110,037 121,698  
Recurring Basis [Member] | Level 3 [Member] | Covered Bonds [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 3 [Member] | Corporate debt [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Level 3 [Member] | Other securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member]
     
Assets measured at fair value on a recurring basis      
Mortgage loans held for sale 0 0  
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Automobile loans 0 0  
MSR's 0 0  
Derivative assets (99,368) (94,082)  
Liabilities measured at fair value on a recurring basis      
Securitization trust notes payable 0 0  
Derivative liabilities (83,415) 0  
Other liabilities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | U.S. Treasury [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Federal agencies - mortgage backed securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | TLGP securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Federal agencies: Other agencies [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Municipal securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Asset-backed Securities [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Covered Bonds [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Corporate debt [Member]
     
Assets measured at fair value on a recurring basis      
Available-for-sale and other securities 0 0  
Recurring Basis [Member] | Netting Adjustments [Member] | Other securities [Member]
     
Assets measured at fair value on a recurring basis      
Trading account securities 0 0  
Available-for-sale and other securities $ 0 $ 0